It actually sounds like Willy is wondering about the "commit" part.
When you subdivide an object, it adds to the existing geometry and smooths the entire shape. You can add/subtract subdivision levels to increase/decrease the amount of added geometry and smoothness in an object.
By "committing" subdivisions, you are telling AC3D to permanently convert the geometry to using the current subdivision level. Once committed, you cannot decrease the subdivision level. (of course, you can apply further subdivision and increase/decrease that as needed).
Hope that helps.
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